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Try below options.
1. Terminate the OC4J when you are in design mode.
2. Delete the contents from the file XXXX--oc4j-app.log (under myprojects folder).
3. Go to tools->preferences->code editor->code insight and set the value to something smaller
I had faced similar issue sometime back and above trick did work for me to some extent.
Additionally check the link https://blogs.oracle.com/shay/entry/is_your_jdeveloper_slow_it_sho